Ryno: These JS files are included in order to enable javascript translation. However, if you don't need any of this, you can manually block each javascript file in your Page_Controller->init() method. Just add something like this to block a javascript file:

I posted on the developer forum about this - I'm not a fan. Even if there is no translatable content on the page, prototype and i18n are included. We should not have to explicitly block javascript files from loading if we're not using them.

It also adds another upgrade step, more baggage to the root page type and so on.